| SECTION VI | RELATIONSHIP OF TOOTH SUPPORT AND ROOT MORPHOLOGY33 |
The area of root attachment is of primary importance to the stability and health of a tooth. Root attachment area depends on root length, the number of roots, and the cross-sectional diameter of the root from the CEJ to the apex. It also depends on the presence or absence of concavities and other root curvatures (Fig. 7-36). These features greatly influence the resistance of a tooth to occlusal and other forces, particularly when they are applied in a lateral (buccolingual) direction.
FIGURE 7-36. Series of stained cross sections of a root of a lower first molar from the crown to near the apices. For each section, the mesial aspect is left, the lingual aspect is at the top, the distal aspect is right, and the buccal aspect is toward the bottom. There is a 10 mm scale between the top and the middle section on the left. A. Cross section through the cervical of the crown showing enamel, dentin, and pulp. (Decay is evident distally—on the right.) B. Cross section near the CEJ. Note the shape of the pulp chamber. C. Cross section of the root trunk slightly coronal to the bifurcation (furcation). Buccal and lingual depressions are coronal to the entrances to the bifurcation. D. Cross section of mesial and distal roots slightly apical to the bifurcation. Note the root canals in both roots. Thickened cementum (darkly stained) is apparent on the furcal aspect (between the roots). E.
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